A clutch is a mechanism for transmitting rotation,  xb flywheel which can be engaged and disengaged. Clutches are useful in devices that have two rotating shafts. In these devices, one shaft is typically driven by a motor or pulley,xb flywheel and the other shaft drives another device. In a for drill instance, one shaft is driven by a motor, and the other drives a drill chuck. The connects the two shafts so that they friction discs, pressed tightly together or against a the flywheel using springs xb  flywheel

Re is many different vehicle  designs but most are based on one or more friction discs, pressed tightly together or against a flywheel using springs. The friction material varies in composition depending on whether the  is dry or wet, and on other considerations. xb  flywheel Friction discs once contained asbestos, but this has been largely eliminated. Clutches found in heavy duty applications such as trucks and competition cars use ceramic clutches that have a greatly increased friction coefficient; however, these have a "grabby" action and are unsuitable xb  for road cars.xb  The spring pressure xb flywheel In a car the  is operated by the left-most pedal using hydraulics or a cable xb flywheel connection from the pedal to the  mechanism. Even though the  may physically be located very close to the pedal, such remote means of actuation (or a multi-jointed linkage) are necessary to eliminate the effect of slight engine movement, engine mountings being flexible by design. With a rigid mechanical linkage, smooth engagement would be near-impossible, because engine movement inevitably occurs as the drive is "taken up  xb flywheel                                            

• A centrifugal clutch is a  that uses centrifugal farce to connect two concentric shafts, with the driving shaft nested inside the driven shaft.xb flywheel

The input of the  is connected to the engine cranks shaft while the output may drive a shaft, chain, or belt. As engine RPM increases, flywheel weighted arms in the  swing outward and force the  to engage. The most common types have friction pads or shoes radically mounted that engage the inside of the rim of housing.xb flywheel